Aipan ritual art is made on floor and walls by drip drawn method. The aipan is traditionally drawn for ceremonies of birth, marriage, and many other festivals throughout the year. The painting patterns differ for each ceremony accordingly.
The central design of the aipan is considered as per the ritual and has a traditional motif while the outer design can be extended or reduced to fit the space (red color background). The dots or Bindu, is an important element without which the aipan is considered unfinished. Paintings drawn on the floor of the prayer room and on the deities' seat has Tantric motifs called as Peetha or Yantra. Aipan is drawn by village women folk who make these beautiful designs.
For more details: http://dsource.in/resource/aipan-uttarakhand