One story 1

Resting flat. Still. A sudden pulse, then tension shifted through my edges. I leaned forward and pivoted one face against the grey surface. A crisp tap echoed. I moved. To my right sat a yellow pair of connected blocks, separated by a brief gap. I adjusted my angle by ninety degrees, sliding forward exactly one unit length until my side brushed the smooth plastic wall of the yellow unit. Contact made. Stability confirmed.