The practice of short focus on a point anywhere, to free awareness and let go in openness :
sthūlarūpasya bhāvasya stabdhāṃ dṛṣṭiṃ nipātya ca |
acireṇa nirādhāraṃ manaḥ kṛtvā śivaṃ vrajet || 80 ||
"One should throw and fix one's gaze
on a gross (outer) objet and (inside keeping quiet).
In a short time, attention becomes relaxed,
and one goes to the divine."
Jeu de briques
Snake
Pacman
Bubble