Below him, he heard the sniffling of Sincerity the badger, and Lublamai’s clucking response, the humming progress of the cleaning construct. Isaac was able to ignore them all, zone them out, focus on the numbers.

He felt a little uncomfortable, unwilling to pursue his work with Lublamai in the room. Isaac was still pursuing his unusual policy of silence. Perhaps I’m just developing a taste for the theatrical, he thought, and grinned. When he had solved his equations as best he could, he dawdled, willing Lublamai to leave. Isaac peered under the walkway at where Lublamai scrawled diagrams on graph paper. He did not look as if he were about to go. Isaac grew tired of waiting.

He picked his way through the miasma of metal and glass that littered his floor and squatted gently with the information-input of the crisis engine on his left. The circuit of machinery and tubes described a meandering circle around the room, culminating in the cheese-filled belljar by his right hand.

Isaac held a flexing metal tube in one hand, its end connected to his laboratory boiler by the far wall. He was nervous, and excited. As quietly as he could, he connected the tube to the power-input valve on the crisis engine. He released the catch and felt the steam begin to fill the motor. There was a hissing hum and a clattering. Isaac knelt over and copied his mathematical formulae on the input keys. He slotted four programme cards quickly into the unit, felt the little wheels slide and bite, saw the dust rise as the engine’s vibrations increased.

He murmured to himself and watched intently.

Isaac felt as if he could sense the power and data passing through the synapses to the various nodes of the dismembered crisis engine. He felt as if the steam was pushing through his own veins, turning his heart into a hammering piston. He flicked three large switches on the unit, heard the whole construction warming up.

The air hummed.

For sluggish seconds, nothing happened. Then, in the dirty belljar, the clump of cheese began to shudder.

Isaac watched it and wanted to shout with triumph. He twisted a dial one hundred and eighty degrees and the thing moved a little more.

Let’s bring on a crisis, Isaac thought, and pulled the lever that made the circuit complete, that brought the glass jar under the attention of the sensory machines.

Isaac had adapted the belljar, cutting away its top and replacing it with a plunger. He reached for this now and began to press it, so that its abrasive bottom moved slowly towards the cheese. The cheese was under threat. If the plunger completed its motion the cheese would be completely crushed.

As Isaac pressed with his right hand, with his left he adjusted knobs and dials in response to juddering pressure gauges. He watched their needles plunge and leap and adjusted the thaumaturgic current in response.